Against his Comedy Central competition, the ginger-haired comic also fared well. "The Daily Show" earned a 1.5 rating, while "The Colbert Report" nabbed a 1.1 rating.

The real challenge will be maintaining the lead over the next few weeks and months. An executive from a rival show said that he expects O'Brien's numbers will dip once the curiosity factor wanes.

However, those numbers are subject to change once national figures come in later today.

Moreover, with the exception of Stewart, they do not represent head-to-head matchups, as Leno and Letterman both kick off their show at 11:30 p.m., while O'Brien begins his 30 minutes earlier.

More to come. Refresh this page for updates.

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